v0.5.0-rc.1

The construction of the srun commands when using launch_task has been modified in two ways:

• It will now fail if unequal partitioning of processes across nodes with the provided nproc and task_ppn #149
• Adding support for hybrid tasks with new task_cpp option in launch_task for srun, and setting OpenMP environment variables. See https://ips-framework.readthedocs.io/en/latest/user_guides/advanced_guide.html#slurm-examples for details. #151

Full Changelog: v0.4.1...v0.5.0-rc.1